Not furry, but we like them anyway.
Reticulated Hillstream Loach
Sewellia lineolata (Valenciennes, 1846)
Also called Tiger hillstream loach, Vietnamese hillstream loach, Gold ring butterfly sucker
From Fast hill streams of central Vietnam (Thua Thien-Hue, Quang Nam, Quang Ngai and Binh Dinh provinces), with records from the Mekong basin in Laos; FishBase also lists China and Cambodia.123
A friendly guide, not veterinary advice. For anything about your pet's health, ask your vet.
At a glance the quick version
Standard length; FishBase gives 5.7 cm, Seriously Fish 6.5 cm.
Looks how to spot one
Flattened hillstream loach
A low, flat-bellied little fish whose wide pectoral and pelvic fins spread out like a skirt, letting it press itself against rocks in strong current. Each side carries three to five bold dark stripes, and the paired fins show one or two neat concentric bands. Males have a squarer snout and develop small tubercles on the pectoral fin rays; females are broader.123
Personality what they are like
Calm and inoffensive toward tankmates. Among their own kind, males hold small patches of rock and will push each other around briefly, which is part of their natural display rather than real conflict.1
Daily activity how busy a day looks
Active during the day, constantly gliding from stone to stone and grazing. Unlike many loaches they ride the current for short distances before settling again, so open rock surfaces and strong flow let them show this behaviour.23
Grooming and care the hands-on bits
Water: 20 to 24 C, pH 6.0 to 7.5, hardness 1 to 10 dGH. Needs very clean, oxygen-rich water with strong flow; Seriously Fish suggests filtration turning the tank volume over 15 to 20 times an hour, plus regular partial water changes.1
Home where they are happiest
A river-style tank with a base of at least 75 x 30 cm (about 68 litres), smooth stones, pebbles and sand, bright light so algae film grows on the rocks, and powerheads for a strong current. Hardy plants such as Anubias or Java fern suit the flow.13
Food basics what goes in the bowl
In nature they graze biofilm, algae and tiny organisms off stones and take some insect larvae. In the aquarium offer algae wafers, sinking dried foods, vegetable-based foods and small frozen foods such as bloodworm, daphnia or brine shrimp, alongside natural algae growth.123
Company who they like around
Lives in large groups in the wild; keep at least six so their natural social behaviour shows. Best with calm, cooler-water tankmates that will not compete heavily for food on the bottom.1
The story where it all began
Valenciennes named the species in 1846 from material first recorded by the collector Diard. It then went unrecorded for well over a century until fresh collections in the early 1990s brought it back to light, after which it reached the aquarium trade.13
Fun facts for the dinner table
- 1
It was effectively lost to science for more than 150 years between its first collection and its rediscovery in the early 1990s.1
- 2
Instead of hopping from rock to rock, it lifts off and glides on the current for a short distance before landing again.3
- 3
Its paired fins work together like a suction pad, letting it cling to stones in fast, shallow rapids.3
- 4
Hillstream loaches as a family number around 137 species in 18 genera across China and Southeast Asia.4
Recognised by the official bits
- IUCN Red List
- Vulnerable (assessed 5 September 2010)2
- Taxonomy
- Family Gastromyzontidae (hillstream loaches); described by Valenciennes in 18463
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Reticulated Hillstream Loach. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseRinse in old tank water, never tap waterevery month
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Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at [email protected] and we will fix it.
- Seriously Fish: Sewellia lineolata seriouslyfish.comused for names, range, size, care, behaviour, history
- FishBase: Sewellia lineolata fishbase.seused for size, range, IUCN status, biology
- Wikipedia: Sewellia lineolata en.wikipedia.orgused for taxonomy, behaviour, diet, aquarium notes
- Wikipedia: Gastromyzontidae en.wikipedia.orgused for family facts
Checked 2026-09-30. Text is written in our own words from these sources.